Hail in Mount Vernon · Sep 4, 2026
The estimated-size surface reached 1.75" aloft; NEXRAD logged no point detections over Mount Vernon that day. Open it on the live map to see the swath over the streets.
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Convective day · Sep 4, 2026 · noon–noon UTC
Severity
The most severe storm Mount Vernon has seen in the last 12 months
Overview's storm severity score weighs hailstone size, homes in the footprint, and ground-truth reports.
- Peak hail signal
- 44 /100
- Homes exposed
- 70 /100
- Ground truth
- 0 /100
Largest radar-indicated size — a signal of damage potential, not confirmation.
How many homes sit inside the storm's footprint.
Independent storm reports filed with the NWS.
Evidence / storm surfaces
How Mount Vernon saw the hail — from two instruments
We map this storm two ways: the NEXRAD radar signatures the storm produced overhead, and the radar-estimated size of the hail in the air. The two surfaces don’t have to match — where they diverge is where estimated size aloft ran ahead of, or behind, what the signatures caught.
Estimated size field Maximum hail size as estimated from radar aloft. Treat it as the storm's ceiling — the largest supportable stone — rather than a ground measurement.
Only the radar-estimated size surface resolved for Sep 4, 2026 — this storm produced no NEXRAD point detections over Mount Vernon, so there is one map to show, not two.
The storm in context
Where Sep 4, 2026 sits in Mount Vernon's hail record.
This was Mount Vernon's 5th recorded hail day, arriving 32 days after the Aug 3, 2026 storm. By severity it ranks 1st of the 6 storms we have logged here. Radar put the day's largest stone over Mount Vernon at 1.75" — radar-estimated size aloft.
The Sep 4, 2026 convective day was bigger than Mount Vernon: the same system put hail over 482 other tracked cities, 41 of them in South Dakota. Nearest: Stickney (10 miles southwest, up to 1"); Mitchell (14 miles northeast, up to 2.25"); Plankinton (15 miles north, up to 2").
These maps are stills. In the app this date is one of 6 Mount Vernon storm dates on a live map — both surfaces, the reports, and a replay — and the same map is where you draw the swath. This page rebuilds nightly.
Ground reports
What people on the ground reported
These are storm reports filed with the National Weather Service and released through the NOAA Storm Prediction Center — public-domain observations from spotters, the public, and NWS surveys. We quote each one exactly as filed.
The National Weather Service logged no spotter reports for this storm over Mount Vernon. That absence is ordinary — filing a report takes a person on the spot who saw the hail and phoned it in. What stands as the record for this date is the radar above, which caught the storm regardless.
High damage potential
What 1.75" hail means for Mount Vernon roofs.
Hail around an inch and a half is capable of cracking shingles, stripping granules, and denting gutters, vents, and siding. Risk is usually greatest near the strongest radar signal, but property-level damage still requires an on-site inspection.
Radar reading · not confirmed damage
Roofing exposure
What this storm is worth to a roofer.
Potential roof exposure
$38M
Potential roof exposure — 3,186 homes × the ~$12,000 industry-average hail roof claim. Exposure, not confirmed damage.
- Illustrative jobs
- 16 jobs
- Illustrative work
- ~$240K
Close just 0.5% of the 3,186 homes in this footprint at the average $15,000 roof job. Illustrative math, not a projection — your results depend on your outreach and how the market responds.
Claim window
September 2028
Claims from this storm can typically be filed until around September 2028 — the window to reach these homeowners while it's still open. Deadlines vary by policy and state.
Names and phones for every home in the footprint: at most $669 on top of the $150 plan.
Mount Vernon hail history
Other storms in Mount Vernon.
Estimated-size surface Sep 6, 2026
0.5"
Estimated-size surface Aug 3, 2026
0.5"
Estimated-size surface Jul 2, 2026
1.75"
Estimated-size surface Jun 30, 2026
1"
Estimated-size surface Jun 27, 2026
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